package filter;


import cart.ShoppingCart;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;



/**
 *
 * @author tgiunipero
 */
@WebFilter(urlPatterns = {"/purchase"})
public class PurchaseWithOutCartFilter implements Filter
{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException
    {
    }

     @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
    {

        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        
        HttpSession session = req.getSession(false);
        
        ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");

        if ((cart == null || cart.getNumberOfItems() == 0) && req.getServletPath().equals("/checkout"))
        {
            resp.sendRedirect("index");
        }
        else
        {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void destroy()
    {
    }
}